36ccdee6ec
Without this, it's possible for stale information to be read from cache via mmap, even if the MMU table entry had been invalidated prior to writing flash (if the same MMU table entry was re-used after writing flash.)
134 lines
4.3 KiB
C
134 lines
4.3 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <freertos/FreeRTOS.h>
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#include <freertos/task.h>
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#include <freertos/semphr.h>
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#include <unity.h>
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#include <esp_spi_flash.h>
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#include <esp_attr.h>
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#include <esp_flash_encrypt.h>
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#include "test_config.h"
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static uint32_t buffer[1024];
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/* read-only region used for mmap tests */
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static const uint32_t start = 0x100000;
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static const uint32_t end = 0x200000;
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TEST_CASE("Prepare data for mmap tests", "[mmap]")
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{
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srand(0);
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for (int block = start / 0x10000; block < end / 0x10000; ++block) {
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printf("Writing block %d\n", block);
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for (int sector = 0; sector < 16; ++sector) {
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for (uint32_t word = 0; word < 1024; ++word) {
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uint32_t val = rand();
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if (block == start / 0x10000 && sector == 0 && word == 0) {
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printf("first word: %08x\n", val);
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}
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buffer[word] = val;
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}
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uint32_t abs_sector = (block) * 16 + sector;
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printf("Writing sector %d\n", abs_sector);
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ESP_ERROR_CHECK( spi_flash_erase_sector((uint16_t) abs_sector) );
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ESP_ERROR_CHECK( spi_flash_write(abs_sector * SPI_FLASH_SEC_SIZE, (const uint8_t *) buffer, sizeof(buffer)) );
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}
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}
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}
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TEST_CASE("Can mmap into data address space", "[mmap]")
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{
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printf("Mapping %x (+%x)\n", start, end - start);
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spi_flash_mmap_handle_t handle1;
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const void *ptr1;
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ESP_ERROR_CHECK( spi_flash_mmap(start, end - start, SPI_FLASH_MMAP_DATA, &ptr1, &handle1) );
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printf("mmap_res: handle=%d ptr=%p\n", handle1, ptr1);
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spi_flash_mmap_dump();
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srand(0);
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const uint32_t *data = (const uint32_t *) ptr1;
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for (int block = 0; block < (end - start) / 0x10000; ++block) {
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for (int sector = 0; sector < 16; ++sector) {
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for (uint32_t word = 0; word < 1024; ++word) {
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TEST_ASSERT_EQUAL_UINT32(rand(), data[(block * 16 + sector) * 1024 + word]);
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}
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}
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}
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printf("Mapping %x (+%x)\n", start - 0x10000, 0x20000);
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spi_flash_mmap_handle_t handle2;
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const void *ptr2;
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ESP_ERROR_CHECK( spi_flash_mmap(start - 0x10000, 0x20000, SPI_FLASH_MMAP_DATA, &ptr2, &handle2) );
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printf("mmap_res: handle=%d ptr=%p\n", handle2, ptr2);
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spi_flash_mmap_dump();
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printf("Mapping %x (+%x)\n", start, 0x10000);
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spi_flash_mmap_handle_t handle3;
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const void *ptr3;
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ESP_ERROR_CHECK( spi_flash_mmap(start, 0x10000, SPI_FLASH_MMAP_DATA, &ptr3, &handle3) );
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printf("mmap_res: handle=%d ptr=%p\n", handle3, ptr3);
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spi_flash_mmap_dump();
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printf("Unmapping handle1\n");
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spi_flash_munmap(handle1);
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spi_flash_mmap_dump();
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printf("Unmapping handle2\n");
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spi_flash_munmap(handle2);
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spi_flash_mmap_dump();
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printf("Unmapping handle3\n");
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spi_flash_munmap(handle3);
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}
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TEST_CASE("flash_mmap invalidates just-written data", "[spi_flash]")
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{
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spi_flash_mmap_handle_t handle1;
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const void *ptr1;
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const size_t test_size = 128;
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if (esp_flash_encryption_enabled()) {
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TEST_IGNORE_MESSAGE("flash encryption enabled, spi_flash_write_encrypted() test won't pass as-is");
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}
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ESP_ERROR_CHECK( spi_flash_erase_sector(TEST_REGION_START / SPI_FLASH_SEC_SIZE) );
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/* map erased test region to ptr1 */
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ESP_ERROR_CHECK( spi_flash_mmap(TEST_REGION_START, test_size, SPI_FLASH_MMAP_DATA, &ptr1, &handle1) );
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printf("mmap_res ptr1: handle=%d ptr=%p\n", handle1, ptr1);
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/* verify it's all 0xFF */
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for (int i = 0; i < test_size; i++) {
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TEST_ASSERT_EQUAL_HEX(0xFF, ((uint8_t *)ptr1)[i]);
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}
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/* unmap the erased region */
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spi_flash_munmap(handle1);
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/* write flash region to 0xEE */
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uint8_t buf[test_size];
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memset(buf, 0xEE, test_size);
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ESP_ERROR_CHECK( spi_flash_write(TEST_REGION_START, buf, test_size) );
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/* re-map the test region at ptr1.
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this is a fresh mmap call so should trigger a cache flush,
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ensuring we see the updated flash.
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*/
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ESP_ERROR_CHECK( spi_flash_mmap(TEST_REGION_START, test_size, SPI_FLASH_MMAP_DATA, &ptr1, &handle1) );
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printf("mmap_res ptr1 #2: handle=%d ptr=%p\n", handle1, ptr1);
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/* assert that ptr1 now maps to the new values on flash,
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ie contents of buf array.
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*/
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TEST_ASSERT_EQUAL_HEX8_ARRAY(buf, ptr1, test_size);
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spi_flash_munmap(handle1);
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}
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